/**
 * Copyright (c) 2006-2015, JGraph Ltd
 * Copyright (c) 2006-2015, Gaudenz Alder
 */
mxCodecRegistry.register(
  (function () {
    /**
     * Class: mxCellCodec
     *
     * Codec for <mxCell>s. This class is created and registered
     * dynamically at load time and used implicitely via <mxCodec>
     * and the <mxCodecRegistry>.
     *
     * Transient Fields:
     *
     * - children
     * - edges
     * - overlays
     * - mxTransient
     *
     * Reference Fields:
     *
     * - parent
     * - source
     * - target
     *
     * Transient fields can be added using the following code:
     *
     * mxCodecRegistry.getCodec(mxCell).exclude.push('name_of_field');
     *
     * To subclass <mxCell>, replace the template and add an alias as
     * follows.
     *
     * (code)
     * function CustomCell(value, geometry, style)
     * {
     *   mxCell.apply(this, arguments);
     * }
     *
     * mxUtils.extend(CustomCell, mxCell);
     *
     * mxCodecRegistry.getCodec(mxCell).template = new CustomCell();
     * mxCodecRegistry.addAlias('CustomCell', 'mxCell');
     * (end)
     */
    var codec = new mxObjectCodec(
      new mxCell(),
      ["children", "edges", "overlays", "mxTransient"],
      ["parent", "source", "target"]
    );

    /**
     * Function: isCellCodec
     *
     * Returns true since this is a cell codec.
     */
    codec.isCellCodec = function () {
      return true;
    };

    /**
     * Overidden to disable conversion of value to number.
     */
    codec.isNumericAttribute = function (dec, attr, obj) {
      return (
        attr.nodeName !== "value" &&
        mxObjectCodec.prototype.isNumericAttribute.apply(this, arguments)
      );
    };

    /**
     * Function: isExcluded
     *
     * Excludes user objects that are XML nodes.
     */
    codec.isExcluded = function (obj, attr, value, isWrite) {
      return (
        mxObjectCodec.prototype.isExcluded.apply(this, arguments) ||
        (isWrite &&
          attr == "value" &&
          value.nodeType == mxConstants.NODETYPE_ELEMENT)
      );
    };

    /**
     * Function: afterEncode
     *
     * Encodes an <mxCell> and wraps the XML up inside the
     * XML of the user object (inversion).
     */
    codec.afterEncode = function (enc, obj, node) {
      if (
        obj.value != null &&
        obj.value.nodeType == mxConstants.NODETYPE_ELEMENT
      ) {
        // Wraps the graphical annotation up in the user object (inversion)
        // by putting the result of the default encoding into a clone of the
        // user object (node type 1) and returning this cloned user object.
        var tmp = node;
        node = mxUtils.importNode(enc.document, obj.value, true);
        node.appendChild(tmp);

        // Moves the id attribute to the outermost XML node, namely the
        // node which denotes the object boundaries in the file.
        var id = tmp.getAttribute("id");
        node.setAttribute("id", id);
        tmp.removeAttribute("id");
      }

      return node;
    };

    /**
     * Function: beforeDecode
     *
     * Decodes an <mxCell> and uses the enclosing XML node as
     * the user object for the cell (inversion).
     */
    codec.beforeDecode = function (dec, node, obj) {
      var inner = node.cloneNode(true);
      var classname = this.getName();

      if (node.nodeName != classname) {
        // Passes the inner graphical annotation node to the
        // object codec for further processing of the cell.
        var tmp = node.getElementsByTagName(classname)[0];

        if (tmp != null && tmp.parentNode == node) {
          mxUtils.removeWhitespace(tmp, true);
          mxUtils.removeWhitespace(tmp, false);
          tmp.parentNode.removeChild(tmp);
          inner = tmp;
        } else {
          inner = null;
        }

        // Creates the user object out of the XML node
        obj.value = node.cloneNode(true);
        var id = obj.value.getAttribute("id");

        if (id != null) {
          obj.setId(id);
          obj.value.removeAttribute("id");
        }
      } else {
        // Uses ID from XML file as ID for cell in model
        obj.setId(node.getAttribute("id"));
      }

      // Preprocesses and removes all Id-references in order to use the
      // correct encoder (this) for the known references to cells (all).
      if (inner != null) {
        for (var i = 0; i < this.idrefs.length; i++) {
          var attr = this.idrefs[i];
          var ref = inner.getAttribute(attr);

          if (ref != null) {
            inner.removeAttribute(attr);
            var object = dec.objects[ref] || dec.lookup(ref);

            if (object == null) {
              // Needs to decode forward reference
              var element = dec.getElementById(ref);

              if (element != null) {
                var decoder = mxCodecRegistry.codecs[element.nodeName] || this;
                object = decoder.decode(dec, element);
              }
            }

            obj[attr] = object;
          }
        }
      }

      return inner;
    };

    // Returns the codec into the registry
    return codec;
  })()
);
